Grease pump



April 22, 1930. w. F. CLARK I I GREASE PUMP Filed June 22, 1928 ill/472% PatentedApr; 1930 .w 'tiiiian a. CLARKQOE CHIo'Aeo, 'ILLINOIS, ASSIGNOR 'ro MONARCH TOOL smegmmay '00., cincAe'o ILIiINoIsA oonroaa'rroir OF ILLINOIS 3 f fennAsn; PU P a Applieationfiledjune 22,

The invention relates to lubricating apparatus and; more particularlyito grease pumps whichare' usedf'or supplying grease or other such lubricantl under a comparatively high pressure to fittings .or cups. for bearings;

One object of the present" invention is to provide a'grea'sepump' of the aforementioned character; in which the, head for closingthe discharge endofthebarrel is held inplace between shoulder a'nd arriwinrolled wall which together operateto form a seal for effectively prevntingrleakage: 'or exudation of the grease adjacent the marginal part of Another object of the invention is the provision of a head for the barrel of a grease pump, which is punched'or struck from a single disk .of sheet metal and is formed or constructed so as to give the maximum amount of rigidity. p

A further object of the invention is to provide a grease pump for use in high pressure lubricating systems, which is of new and improved construction, may be manufactured or fabricated at a comparatively low cost and is eiiicient in operation.

Other objects of the invention and the .various advantages and characteristics of the present construction will be apparent from a consideration of the following detailed description.

I The invention consists in the several novel features hereinafter set forth and more particularly defined by the claims 'at'the conclusion hereof.

In the drawing wh ch accompanies and forms a part of this disclosure or specification and which like numerals of reference denote corresponding parts throughout the several views: s

Figure 1 is a side elevational view of a grease pump embodying the invention;

FigureJQ is a sectional view of the sheet metal head for closing the discharge end of the pump; I

Figure 3 is a longitudinal section of the pump barrel, showing the same prior to the mounting or connection of the head; and

"Figure-'4: is a sectional View similar to Figure 3', showing the head securedin its oper the'pump is light andv may be manipulated bulged or concave-convex central portion 16 1928. SeriaI No. 287,462.

ative position between the shoulder main-f rolledor beaded over wall of the barrel. I J

'Theinvention is exemplified in'agrea'se pump which'is adapted primarily for use in supplying grease or; other such lubricant -un-' der high pressure to fittings or cups, and

comprises an'elongated cylindrical 'barrel 5. The latter is preferablyformed of metal-tub ing having a comparatively thin'wallso that or handledwithease. The interior of the barrel 5 forms a compartment or cylinder 6 for the grease. The endof the barrel through which the lubricant is inserted intothe cylindex: 6 is normally closed by a head 7'. This head is'provided with an inwardly extend.-

ing annular flange 8 which is'removably con- I nected to the barrel by a screwthread connection 9. 'A. boss 10 is integrally'formed with the'central portion of the head '7 and is provided with an internally-threaded bore for receiving the externally threaded stem '11 of a piston 12. This piston has'secured thereto 'a' leather cup or similarplunger-elei ment 13 and is operative during reciproc'atory movement thereof caused by relative rotation of-the stem'and head 7 to force or exude the grease from the cylinder '6'. Tl'ie 'outer end of the stem11is provided-with a handle 14 to facilitate:the'operation of the'piston 12. I

The discharge end of the barrel .5 is permanently closed by a head '15 which is punched or struckfrom a circular disk of sheet meta-landcomprises an outwardly and avradiall-y extendingrmarginal portion 17. The latter -1sconnected to the concavoconvex central portion "16 by. an axially extendingor offset portion 18 w hichresults in the formation an annularv recess 19;;and l a shoulder 20 on the outer facefof saidjhead 15; The end of'the barrelbopposite the g re movable head is drilled or-machinedft o form a bore 21, whichis-slightly larg fin diafneter' than that ofthe cylinder or compart} ment 6, This bore eXtends inwardly a corn V paratively short distance from the edge of the barrel and operates5tof form; z n -annular shoulder. 22, Th bore '21 :causes 'thethiclig" test -e them tal new to be reduced and consequently forms a relatively thin cylindrical wall 23. The head is arranged within the enlarged bore 21 so that the inner face of the marginal part 17 fits and abuts against the shoulder 22. The

diameter of the head 15 is such that the pe riphery of the marginal portion 17 fits snug ly against the thin or weakened wall The Pertion. 9 s id. all tha ext nds outwardy of the arginal p rtion 17 is bea ed v or rolled inwardly as at 24 toclamp said portion 17 against the shoulder 22. The inrolled part of the wall 23 fits within the recess 19 and the edge thereof abuts again th 19.

der 20, as shown in Figure 4, toform a supplemental'seal. By clamping the head in place in this manner leakage or exudation'of the grease around the marginal portion of said head is effectively avoided. In addition, the wall and shoulder 22 exemplify means of animproved character whereby the head is held in its operative position by a minimum amount of metal. A characteristic of bulging the central portion 16' outwardly is that "the head embodies a maximum amount of conduit 28'. An advantage of forming the boss so that it extends inwardly instead of outwardly is that it is completely housed and consequently{protected against injury. -The distal end of the conduit 28, is provided with quickly detachable coupling 29 which is quickly connectible. to suitably formed fittings or cups, as well understood in the art.

The pump herein disclosed may be manufactured' at a low cost, is extremely light in that" no casting or solid metal head is used to close the discharge end'of the barrel, and

' embodies means of an improved character for securing thedischarge-head in place.

on the outer face of the head, the outer end of the aforesaid wall being rolled inwardly and fitting in the recess to secure said marginal portion of the head in its operative position against the shoulder, means for closing the other end of'the barrel, and a piston slidably mounted in thebarrel and operable to. force grease therefrom.

2. A grease pump comprising a cylindrical barrel formed of a tubular piece ofmetal,

one end of said barrel being bored to form an annular shoulder and a comparatively thin wall, a circular head for closing said one end of the, barrel, said head being stamped from a single disk of metal and consisting of an outwardly'bulged central portion, a radially extending marginal portion and an offset part between and connecting said marginal and central portions, said head being formed and arrangedso that the marginal portion thereof The invention is not to be understood as I restricted to the details set forth, since these may be modified Within the scopeof the appended cla'ims, ithout departing from the Spirit and scope-of the invention. I

Haying thus described the invention, What Iclaim as'new and desireto secure Letters Patentis: f 7

Q1 Afgre'ase pump comprising a cylindrical barrel formed of atubular piece of metal, one en'd of said barrelf being bored to form an annular shoulder and a comparatively thin wall, a circularhead' for closing said one end ofthe barrel, the marginal portion of the headbeing arranged against the annular shouland c n ecte it he ntral p t on y n offset part so as a; form an a'imular recess 

